@inbook{8543,
  author = {C. Ambruster and S. Sciortino and L. Golub},
  title = {Rapid x-ray variability in Einstein observations of K and M Dwarfs},
  year = {1986},
  volume = {254},
  number = {Lecture Notes in Physics},
  pages = {219-221},
  publisher = {Springer Berlin Heidelberg},
  address = {Berlin, Heidelberg},
  isbn = {978-3-540-16763-1},
  doi = {10.1007/3-540-16763-3_177},
}